October 21 (Eastern Orthodox liturgics)
October 20 - Eastern Orthodox liturgical calendar - October 22
All fixed commemorations below celebrated on November 3 by Orthodox Churches on the Old Calendar.
For October 21st, Orthodox Churches on the Old Calendar commemorate the Saints listed on October 8.
Venerable Hilarion the Great.
Martyrs Dasius, Gaius, and Zoticus, at Nicomedia.
Saint Cilinia of Laon.
St. Wendelin of Trier.
Saint Hilarion of Kiev, Metropolitan of Kiev.
Sts. Bessarion (Sarai) and Sophronius of Ciorara, Confessors, and St. Oprea of Săliște.
New Hieromartyr Alexis (Bui), Bishop of Voronezh.
New Hieromartyr Paulinus (Kroshechkin), Archbishop of Mogilev.
New Hieromartyr Arcadius (Yershov), Bishop of Ekaterinburg.
New Hieromartyr Damian (Voskresensky), Archbishop of Kursk.
Greek Sources
Russian Sources
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Wikipedia